<!doctype html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport"
        content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        #box {
            width: 200px;
            height: 900px;
            background-color: aqua;
        }

        .haha,
        .wowo {
            height: 100px;
            width: 101px;
        }


        #box>.wowo:nth-of-type(odd) .word {
            color: azure;
        }

        #box>.wowo:nth-of-type(even) .word {
            color: blueviolet;
        }
    </style>
</head>

<body>
    <div id="box">
        <div class="haha">haha</div>
        <div class="wowo">
            <div class="word">
                word
            </div>
            <div class="picture">
                piuture
            </div>
        </div>
        <div class="haha">haha</div>
        <div class="wowo">
            <div class="word">
                word
            </div>
            <div class="picture">
                piuture
            </div>
        </div>
        <div class="wowo">
            <div class="word">
                word
            </div>
            <div class="picture">
                piuture
            </div>
        </div>
        <div class="haha">haha</div>
    </div>
</body>

</html>